It’s got 6.41 GB of onboard storage. I’ve been using mine heavily for note taking, reading articles, and some pdf markup and still use less than 2 GB.

I guess if you needed to work with a large number of media rich pdf, it could become a problem. But there are solutions. Either officially supported - dropbox et al. integration, or you can just ssh into the device and set up a syncing scheme of your liking.

So I really cannot image what are you talking about.